ABR에서 반복회수 설정에 의한 전력선 잡음의 제거

Power Line Noise Reductions in ABR by Properly Chosen Iteration Numbers

  • 안주현 (연세대학교 생체공학 협동과정, 연세대학교 의과대학 의학공학교실) ;
  • 김수찬 (연세대학교 생체공학 협동과정, 연세대학교 의과대학 의학공학교실) ;
  • 남기창 (연세대학교 생체공학 협동과정, 연세대학교 의과대학 의학공학교실) ;
  • 심윤주 (연세대학교 의과대학 이비인후과학교실) ;
  • 김희남 (연세대학교 의과대학 이비인후과학교실) ;
  • 송철규 (전북대학교 공과대학 생체공학과) ;
  • 김덕원 (연세대학교 의과대학 의학공학교실)
  • 발행 : 2001.06.01

초록

ABR(auditory brainstem response) is one of the audiometry which measures objective hearing threshold level by acquiring electric evoked potentials emanated from auditory nerve system responding to an auditory stimulation. However, the obtained potentials which are largely interfered by power line noise, have extremely low SNR, thus ensemble average algorithm is generally used. The purpose of this study was to investigate the effect of iteration number in ensemble average on the reduction of the power line noise. The power line noise was modeled to be a 60 Hz sinusoidal signal and the energy of the modeled signal was calculated when it was averaged. It was verified by simulation that the energy had the periodic zero points for each stimulation rate, and 60 Hz signal induced by the power line was applied to the developed ABR system to confirm that the period of zero energy point was the same with that of the simulation. By the properly selected iteration number, power line noise could be reduced and more reliable ABR could be acquired.

키워드

참고문헌

  1. Handbook of Auditory Evoked Responses J.W.Hall III
  2. Evoked Potential Audiometry R. Goldstein;W. M. Aldrich
  3. IEEE Trans. On Biomedical Eng. v.35 no.5 Recovery of auditory brainstem response by sign-bit and conventional averaging D. G. Jamieson;E. B. Slawinski
  4. Annals of the N.Y. Academy of Science v.388 Distribution of Auditory Brainstem Potentials over the Scalp and Nasopharynx A. Starr;K. Squires
  5. Signal and Linear System Analysis G. E. Carlson
  6. ABR에서의 반복회수 설정에 의한 전력선 잡음의 제거 안주현